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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c5aaeef9ca0d4bfc3c701e36188e444b510a390f6f4d0c4f6b4f5389ce8b7fd' 
  AND token = 'vMts6EN0wMfmdWX/gbzn0DwJWiNKSeHOj2itCDt4HII=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00081

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}